Dynasty rankings don't change based on scoring format.
Edited
What you're seeing is a difference in ranking types. Dynasty rankings use a consensus rankings system which averages out the overall ranking of a player. For dynasty this makes sense as there’s not really a way (accurately) to project the points of a player over their career.
Redraft rankings utilize a point projection system for an upcoming season since you don’t have the variable of dynasty/career lengths etc involved. We strongly recommend not using an “overall” rankings list and instead utilizing positional rankings as this will lead to a much better draft as you can address things like positional scarcity, league format, roster construction etc.